Honestly, I want a little one for my lawn. Set the boundaries and let it go at midnight to quietly wander the lawn and spray the weeds. If it could spray into

Honestly, I want a little one for my lawn. Set the boundaries and let it go at midnight to quietly wander the lawn and spray the weeds. If it could spray into nearby garden beds too, so much the better. Being infinitely patient it could apply small targeted doses to only what you don't want. A human doing it often doesn't have the patience or accuracy.